unprinted_designs=['phone case','robot pendant','dodecahedron']
completed_models=[]

while unprinted_designs:
    current_design=unprinted_designs.pop()
    print(f"Printing model: {current_design}")
    completed_models.append(current_design)

print("\nThe following models have been printed:")
for completed_model in completed_models:
    print(completed_model)